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Application needs to save WhatsApp Chat History on Android version 2.x and higher. Android phone should not be rooted or unlocked.
Application will run as a service and when incoming and outgoing IM’s are sent or received they should be recorded to a text file on local device (From, To, Date, Content)
If application needs to modify WhatsApp application then it should be done without user intervention.
No GUI, or settings will be needed.